Abstract A new polycyclic N-heterocyclic carbene featuring a fused dibenz [a, c] phenazine moiety was generated in situ from the corresponding tetrafluoroborate salt. The synthesis and NMR data of its corresponding precursors, its sulfur adduct and dimer are reported. Complexes of type [MCl (COD)(1)] and [MCl (CO) 2 (1)](M= Rh and Ir, 1= 1, 3-dibutyldibenzo [a, c] phenazino [11, 12-d] imidazol-2-ylidene) were prepared and characterized using ...